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SQL support for Querydsl
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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.querydsl.sql;

import java.sql.Types;

import com.querydsl.core.types.Ops;

/**
 * {@code HSQLDBTemplates} is an SQL dialect for HSQLDB
 *
 * @author tiwe
 *
 */
public class HSQLDBTemplates extends SQLTemplates {

    @SuppressWarnings("FieldNameHidesFieldInSuperclass") //Intentional
    public static final HSQLDBTemplates DEFAULT = new HSQLDBTemplates();

    public static Builder builder() {
        return new Builder() {
            @Override
            protected SQLTemplates build(char escape, boolean quote) {
                return new HSQLDBTemplates(escape, quote);
            }
        };
    }

    public HSQLDBTemplates() {
        this('\\', false);
    }

    public HSQLDBTemplates(boolean quote) {
        this('\\', quote);
    }

    public HSQLDBTemplates(char escape, boolean quote) {
        super(Keywords.HSQLDB, "\"", escape, quote, false);
        setLimitRequired(true);
        setAutoIncrement(" identity");
        setDefaultValues("\ndefault values");
        setFunctionJoinsWrapped(true);
        setUnionsWrapped(false);

        setPrecedence(Precedence.ARITH_HIGH, Ops.CONCAT);
        setPrecedence(Precedence.ARITH_LOW + 1, Ops.NOT);
        setPrecedence(Precedence.COMPARISON, Ops.EQ, Ops.EQ_IGNORE_CASE, Ops.NE);
        setPrecedence(Precedence.COMPARISON + 1, Ops.IS_NULL, Ops.IS_NOT_NULL, Ops.LIKE, Ops.LIKE_ESCAPE, Ops.BETWEEN,
                Ops.IN, Ops.NOT_IN, Ops.EXISTS);

        setPrecedence(Precedence.COMPARISON + 1, OTHER_LIKE_CASES);

        add(Ops.TRIM, "trim(both from {0})");
        add(Ops.NEGATE, "{0} * -1", Precedence.ARITH_HIGH);

        add(SQLOps.NEXTVAL, "next value for {0s}");

        add(Ops.MathOps.POWER, "power({0},{1s})");
        add(Ops.MathOps.ROUND, "round({0},0)");
        add(Ops.MathOps.LN, "log({0})");
        add(Ops.MathOps.LOG, "(log({0}) / log({1}))");
        add(Ops.MathOps.COSH, "(exp({0}) + exp({0*'-1'})) / 2");
        add(Ops.MathOps.COTH, "(exp({0*'2'}) + 1) / (exp({0*'2'}) - 1)");
        add(Ops.MathOps.SINH, "(exp({0}) - exp({0*'-1'})) / 2");
        add(Ops.MathOps.TANH, "(exp({0*'2'}) - 1) / (exp({0*'2'}) + 1)");

        add(Ops.DateTimeOps.WEEK, "extract(week_of_year from {0})");
        add(Ops.DateTimeOps.YEAR_WEEK, "extract(year from {0}) * 100 + extract(week_of_year from {0})", Precedence.ARITH_LOW);

        add(Ops.DateTimeOps.ADD_YEARS, "dateadd('yy', {1s}, {0})");
        add(Ops.DateTimeOps.ADD_MONTHS, "dateadd('mm', {1s}, {0})");
        add(Ops.DateTimeOps.ADD_WEEKS, "dateadd('week', {1s}, {0})");
        add(Ops.DateTimeOps.ADD_DAYS, "dateadd('dd', {1s}, {0})");
        add(Ops.DateTimeOps.ADD_HOURS, "dateadd('hh', {1s}, {0})");
        add(Ops.DateTimeOps.ADD_MINUTES, "dateadd('mi', {1s}, {0})");
        add(Ops.DateTimeOps.ADD_SECONDS, "dateadd('ss', {1s}, {0})");

        add(Ops.DateTimeOps.DIFF_YEARS, "datediff('yy', {0}, {1})");
        add(Ops.DateTimeOps.DIFF_MONTHS, "datediff('mm', {0}, {1})");
        add(Ops.DateTimeOps.DIFF_WEEKS, "trunc(datediff('dd', {0}, {1}) / 7)");
        add(Ops.DateTimeOps.DIFF_DAYS, "datediff('dd', {0}, {1})");
        add(Ops.DateTimeOps.DIFF_HOURS, "datediff('hh', {0}, {1})");
        add(Ops.DateTimeOps.DIFF_MINUTES, "datediff('mi', {0}, {1})");
        add(Ops.DateTimeOps.DIFF_SECONDS, "datediff('ss', {0}, {1})");

        add(Ops.DateTimeOps.TRUNC_YEAR,   "trunc({0},'YY')");
        add(Ops.DateTimeOps.TRUNC_MONTH,  "trunc({0},'MM')");
        add(Ops.DateTimeOps.TRUNC_WEEK,   "trunc({0},'WW')");
        add(Ops.DateTimeOps.TRUNC_DAY,    "trunc({0},'DD')");
        add(Ops.DateTimeOps.TRUNC_HOUR,   "trunc({0},'HH')");
        add(Ops.DateTimeOps.TRUNC_MINUTE, "trunc({0},'MI')");
        add(Ops.DateTimeOps.TRUNC_SECOND, "trunc({0},'SS')");

        add(Ops.DateTimeOps.DATE, "convert({0}, date)");

        add(SQLOps.GROUP_CONCAT2, "group_concat({0} separator '{1s}')");

        addTypeNameToCode("character", Types.CHAR, true);
        addTypeNameToCode("float", Types.DOUBLE, true);
        addTypeNameToCode("real", Types.DOUBLE);
        addTypeNameToCode("nvarchar", Types.VARCHAR);
    }

    @Override
    public String getCastTypeNameForCode(int code) {
        if (code == Types.VARCHAR) {
            return "varchar(10)";
        } else {
            return super.getCastTypeNameForCode(code);
        }
    }

}